CN105607025A - High voltage lead angle error influence testing device and testing method thereof - Google Patents
High voltage lead angle error influence testing device and testing method thereof Download PDFInfo
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Abstract
The invention relates to a high voltage lead angle error influence testing device and a testing method thereof. The device comprises a voltage regulator, a test transformer, a standard transformer, an equipotential shielded capacitor voltage transformer (CVT) test sample and a high voltage lead, wherein the primary side of the test transformer is connected with the voltage regulator, one end of the secondary side is grounded, and the other end of the secondary side is connected with one end of a current limiting resistor R; the other end of the current limiting resistor R is respectively connected with the primary side of the standard voltage transformer and the primary side of the equipotential shielded capacitor voltage transformer test sample; the secondary side of the standard voltage transformer and the secondary side of the equipotential shielded capacitor voltage transformer test sample are both connected with a transformer calibrator; and an angle is formed between the high voltage lead and the axis of the equipotential shielded capacitor voltage transformer test sample. Conditions of different high voltage lead connection modes can be simulated successfully, the accuracy of the CVT in the conditions is verified to still achieve requirements of a high-precision accuracy grade, and in the above conditions, the generated error changes are smaller than those of a CVT with a traditional structure.
Description
Technical field
The present invention relates to a kind of power system transformer device and method thereof, specifically relate to a kind of high-voltage connection angular error impactExperimental rig and test method thereof.
Background technology
Along with the engineering application of extra-high voltage (exchange 1000kV and more than) technology of transmission of electricity, the Measurement accuracy of extra-high voltage grid voltageBecome the key technical problem that requires study and solve. The power frequency high voltage meter of power system extensive use mainly contains electromagnetic typeTwo kinds of voltage transformer and capacitance type potential transformers (both all belong to passive voltage measurement system), can meet substantiallyThe requirement of 500kV and following electric pressure voltage measurement and relay protection. Optical Potential Transformer, electronic type voltage transformer(all belonging to active voltage measuring system) is also in research and development and trial run process at present, still has voltage measurement precision, laser instrumentThe problem such as life-span, system reliability need further be researched and solved, and not yet obtains sizable application.
When entering ultra-high/extra-high voltage grade, electromagnetic potential transformer is because insulation difficulty seldom adopts. Capacitor voltage mutual inductanceDevice (CVT) due to simple in structure, reliability is high, cost is lower, be still ultra-high/extra-high voltage grade line voltage measure mainly establishStandby. But the design of domestic and international existing CVT is applied to extra-high voltage grid, run into following technical difficulty:
1) stray capacitance current affects accuracy of measurement:
Traditional capacitance type potential transformer (CVT), between capacitive divider high-voltage arm and grounding body or electrical body aroundHave stray capacitance, under action of high voltage, stray capacitance outflow of bus current or inflow high-voltage arm, cause voltage measurement error. ThisPlanting error strengthens along with increasing of electric pressure. NORTHWEST CHINA 750kV electrical network capacitance type potential transformer measured result, spuiousThe measure error that electric current (comprising capacitance current and insulation sleeve surface leakage current) causes can be up to more than 0.2%. Electric Field SimulationShow, the CVT of 1000kV, the capacitance current that flows into the earth from divider high-voltage arm can reach 20mA, causes significant measurementError. Conventionally adopt the measure that strengthens divider main capacitance amount to reduce the impact of stray electrical current, even but capacitance increase to10000pf, the class of accuracy of extra-high voltage CVT is the difficult standard that reaches 0.1 grade also.
2) on-the-spot effect difficulty:
Existing CVT measure error is subject to stray capacitance influences thereby relevant with installation site. The CVT of ultra-high/extra-high voltage electric pressure existsAfter on-the-spot installation, need to carry out on-the-spot effect, to revise ratio and the angular difference measured while dispatching from the factory. Carry out at ultra-high voltage transformer stationThe on-the-spot effect of transformer is by no means easy. Except extra-high voltage reference capacitor manufacture difficulty, the on-the-spot electromagnetism of ultra-high voltage transformer stationDisturbing is also the important restriction factor that carries out the comparison of on-the-spot accurately effect.
3) CVT response characteristic problem:
The extensive use of digital relay protection system has proposed more and more higher requirement, requirement to the response characteristic of voltage transformerTransformer secondary voltage should quick and precisely reflect the variation of primary voltage. Relevant code requirement, after the elementary shorted to earth of transformer,Secondary voltage should be down to below 0.1 of initial value in 0.2 second. Existing CVT all adopts the ferromagnetic resonance of energy-storage travelling wave tube compositionDamper, to suppress issuable ferromagnetic resonance in electromagnetic unit. The introducing of energy-storage travelling wave tube makes the response characteristic variation of transformer,Be difficult to meet the requirement that extra-high voltage grid relay protection is quick and precisely moved. Still do not carry out for capacitance type potential transformer at presentHigh-voltage connection error effect test method, this test method is the first.
Summary of the invention
For the deficiencies in the prior art, the object of this invention is to provide a kind of high-voltage connection angular error affects experimental rig and examination thereofProved recipe method, the present invention has successfully simulated the situation of different high-voltage connection connected modes, and has verified CVT its standard in this kind of situationExactness still can reach the requirement of high accuracy class of accuracy, and the error change producing is in these cases less than conventional junctionStructure CVT.
The object of the invention is to adopt following technical proposals to realize:
The invention provides a kind of high-voltage connection angular error affects experimental rig, and its improvements are, described device comprises pressure regulationDevice, testing transformer, standard mutual inductor and equal potential shielded capacitor voltage transformer test product and high-voltage connection; Described testThe former limit of transformer is connected with pressure regulator, one end ground connection of secondary, and the other end is connected with one end of current-limiting resistance R; Current-limiting resistanceThe other end of R connects with the primary side of standard potential transformer and the primary side of equal potential shielded capacitor voltage transformer test product respectivelyConnect; The secondary side of the secondary side of described standard potential transformer and equal potential shielded capacitor voltage transformer test product all and transformerTester connects; The axis of described high-voltage connection and equal potential shielded capacitor voltage transformer test product is at an angle to each other.
Further, described testing transformer, standard potential transformer, equal potential shielded capacitor voltage transformer test product and neighbourThe nearly equal ground connection of grounding body.
Further, described high-voltage connection, as soft bus, adopts diameter 300mm bellows, utilizes the hanging point of outdoor boat carBy the axis arranged angle of high-voltage connection and equal potential shielded capacitor voltage transformer test product, ensure equal potential shielded capacitor electricityPress transformer test product in error measure process within the scope of 6-8m without brush discharge.
Further, the capacitance type potential transformer of measuring supply voltage is apart from equal potential shielded capacitor voltage transformer test product distance(required distance is herein taking noiseless as foundation to test product, avoids because the object around test product is due to apart from test product from enough far awayThereby cross closely, the result of the test of test product is produced and is disturbed), equal potential shielded capacitor voltage transformer test product distance test (DT) transformer footEnough far away, to reduce interference each other.
The present invention also provides a kind of high-voltage connection angular error to affect the test method of experimental rig, and its improvements are, described inMethod comprises the steps:
1) change the angle between high-voltage connection and equal potential shielded capacitor voltage transformer test product axis;
2) utilize the hanging point of outdoor boat car that high-voltage connection is arranged to above-mentioned angle; High-voltage connection uses the ripple of diameter 300mmLine pipe;
3) capacitance type potential transformer of placement measurement supply voltage and testing transformer are apart from equal potential shielded capacitor voltage mutual inductanceDevice test product distance is enough far away;
4) error of measurement equal potential shielded capacitor voltage transformer test product.
6, test method as claimed in claim 5, is characterized in that, described step 2) in, high-voltage connection and Equipotential shieldThe angle of covering between capacitance type potential transformer test product axis ensures that equal potential shielded capacitor voltage transformer test product is in error measureIn process within the scope of 6-8m without brush discharge.
Further, described step 4) in, the error measure of equal potential shielded capacitor voltage transformer test product is with reference to JJG314-2010Voltage ct calibrating code for middle measurement.
Compared with the prior art, the beneficial effect that the present invention reaches is:
High-voltage connection angular error provided by the invention affects experimental rig and test method thereof, has successfully simulated and has had contiguous ground connectionThe situation of body, has verified that capacitance type potential transformer CVT is under nearby device Grounding, and whether its degree of accuracy still can reachTo the requirement of high accuracy class of accuracy, and whether the error change producing is in these cases less than traditional structure capacitive batteryPress transformer CVT.
The capacitance type potential transformer CVT that measures supply voltage is enough far away apart from electrical body, measures the CVT distance of supply voltageCVT test product is enough far away, and CVT test product distance test (DT) transformer is enough far away, reduces interference each other.
The present invention ensure CVT test product in error measure process within the scope of 6-8m without brush discharge, reduced test difficulty, carryHigh operability also can be carried out lower comparative analysis at same case with the CVT of traditional structure.
Brief description of the drawings
Fig. 1 is that the test of equal potential shielded capacitor voltage transformer high-voltage connection angular error impact test provided by the invention connectsLine chart.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The invention provides a kind of high-voltage connection angular error affects experimental rig, and this device comprises pressure regulator. Testing transformer, markAccurate transformer and equal potential shielded capacitor voltage transformer test product and high-voltage connection; Former limit and the tune of described testing transformer T2Depressor T1Connect, one end ground connection of secondary, the other end is connected with one end of current-limiting resistance R; The other end of current-limiting resistance R dividesBe not connected with the primary side of standard potential transformer and the primary side of equal potential shielded capacitor voltage transformer test product; Described standardThe secondary side of the secondary side of voltage transformer and equal potential shielded capacitor voltage transformer test product is all connected with mutual-inductor tester;The axis of described high-voltage connection and equal potential shielded capacitor voltage transformer test product is at an angle to each other.
Pressure regulator T1, standard potential transformer, equal potential shielded capacitor voltage transformer test product and the equal ground connection of contiguous grounding body.
High-voltage connection is as soft bus, adopts diameter 300mm bellows, the hanging point that utilizes outdoor boat car by high-voltage connection with etc.The axis arranged angle of current potential shielded capacitor voltage transformer test product, ensures that equal potential shielded capacitor voltage transformer test product existsIn error measure process within the scope of 6-8m without brush discharge.
Measure capacitance type potential transformer distance high-voltage lead-in wire and the equal potential shielded capacitor voltage transformer test product foot of supply voltageIt is enough that far (required distance herein, taking noiseless as foundation to test product, is avoided because test product object is around due to excessively near apart from test productThereby the result of the test of test product is produced and disturbed. For different concrete tests, due to experimental condition difference, distance is also different.Need specifically to consider as the case may be. ), equal potential shielded capacitor voltage transformer test product distance test (DT) transformer is enough far away, withReduce interference each other.
The present invention also provides a kind of high-voltage connection angular error to affect the test method of experimental rig, comprises the steps:
1) change the angle between high-voltage connection and equal potential shielded capacitor voltage transformer test product axis, to measure different high pressureIn lead-in wire connected mode situation on its accurately on impact;
2) utilize the hanging point of outdoor boat car that high-voltage connection is arranged to above-mentioned angle; Ensure equal potential shielded capacitor voltage mutual inductanceDevice test product in error measure process within the scope of 6-8m without brush discharge. High-voltage connection uses the bellows of diameter 300mm.
3) place capacitance type potential transformer and testing transformer distance and the equal potential shielded capacitor electricity of measuring supply voltagePress transformer test product enough far away, to reduce interference each other. By relatively, known test specimen and standard mutual inductor itBetween deviation size, thereby the grade of errors of known equal potential shielded capacitor voltage transformer test product.
4) error of measuring equal potential shielded capacitor voltage transformer test product is with reference to JJG314-2010 " measurement voltage transformerVertification regulation ".
This test method can change supply voltage grade (this test adopts 1000kV electric pressure) according to test requirements document, can rootChange angle between CVT model machine high-voltage connection and model machine axis according to testing ground situation and practical operation situation, to obtain differenceError effect under connected mode. This test method has reduced test difficulty, improved operability and can with the CVT of traditional structureCarry out lower comparative analysis at same case.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although referenceAbove-described embodiment has been described in detail the present invention, and those of ordinary skill in the field still can be to of the present invention concreteEmbodiment is modified or is equal to replacement, and these do not depart from any amendment of spirit and scope of the invention or are equal to replacement,Within the claim protection domain of the present invention all awaiting the reply in application.
Claims (7)
1. high-voltage connection angular error affects an experimental rig, it is characterized in that, described device comprises pressure regulator, test transformationDevice, standard mutual inductor and equal potential shielded capacitor voltage transformer test product and high-voltage connection; The former limit of described testing transformerBe connected with pressure regulator, one end ground connection of secondary, the other end is connected with one end of current-limiting resistance R; The other end of current-limiting resistance R dividesBe not connected with the primary side of standard potential transformer and the primary side of equal potential shielded capacitor voltage transformer test product; Described standardThe secondary side of the secondary side of voltage transformer and equal potential shielded capacitor voltage transformer test product is all connected with mutual-inductor tester;The axis of described high-voltage connection and equal potential shielded capacitor voltage transformer test product is at an angle to each other.
2. high-voltage connection angular error as claimed in claim 1 affects experimental rig, it is characterized in that described pressure regulator, markAccurate voltage transformer, equal potential shielded capacitor voltage transformer test product and the equal ground connection of contiguous grounding body.
3. high-voltage connection angular error as claimed in claim 1 affects experimental rig, it is characterized in that, described high-voltage connection is doneFor soft bus, adopt diameter 300mm bellows, utilize the hanging point of outdoor boat car by high-voltage connection and equal potential shielded capacitorThe axis arranged angle of voltage transformer test product, ensures that equal potential shielded capacitor voltage transformer test product is in error measure processWithin the scope of 6-8m without brush discharge.
4. high-voltage connection angular error as claimed in claim 1 affects experimental rig, it is characterized in that, measurement supply voltageEnough far (required distance is herein with right apart from equal potential shielded capacitor voltage transformer test product distance for capacitance type potential transformerTest product is noiseless is foundation, thereby avoids because test product object around produces the result of the test of test product owing to crossing apart from test product closelyDisturb), equal potential shielded capacitor voltage transformer test product distance test (DT) transformer is enough far away, to reduce interference each other.
5. the high-voltage connection angular error as described in any one in claim 1-4 affects a test method for experimental rig, itsBe characterised in that, described method comprises the steps:
1) change the angle between high-voltage connection and equal potential shielded capacitor voltage transformer test product axis;
2) utilize the hanging point of outdoor boat car that high-voltage connection is arranged to above-mentioned angle; High-voltage connection uses the ripple of diameter 300mmLine pipe;
3) capacitance type potential transformer of placement measurement supply voltage and testing transformer are apart from equal potential shielded capacitor voltage mutual inductanceDevice test product distance is enough far away;
4) error of measurement equal potential shielded capacitor voltage transformer test product.
6. test method as claimed in claim 5, is characterized in that, described step 2) in, high-voltage connection and Equipotential shieldThe angle of covering between capacitance type potential transformer test product axis ensures that equal potential shielded capacitor voltage transformer test product is in error measureIn process within the scope of 6-8m without brush discharge.
7. test method as claimed in claim 5, is characterized in that, described step 4) in, equal potential shielded capacitor electricityPress the error measure of transformer test product with reference to measuring in JJG314-2010 by voltage ct calibrating code.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410682101.1A CN105607025A (en) | 2014-11-24 | 2014-11-24 | High voltage lead angle error influence testing device and testing method thereof |
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| CN201410682101.1A CN105607025A (en) | 2014-11-24 | 2014-11-24 | High voltage lead angle error influence testing device and testing method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201285439Y (en) * | 2008-11-13 | 2009-08-05 | 国网武汉高压研究院 | Integrated verification equipment for field CVT |
| CN101833043A (en) * | 2010-03-30 | 2010-09-15 | 广元电业局 | Method for measuring electric capacity and dielectric loss of capacitance type voltage transformer |
| CN104155626A (en) * | 2014-08-15 | 2014-11-19 | 国家电网公司 | System of detecting ground potential rising-resisting ability of voltage transformer |
-
2014
- 2014-11-24 CN CN201410682101.1A patent/CN105607025A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201285439Y (en) * | 2008-11-13 | 2009-08-05 | 国网武汉高压研究院 | Integrated verification equipment for field CVT |
| CN101833043A (en) * | 2010-03-30 | 2010-09-15 | 广元电业局 | Method for measuring electric capacity and dielectric loss of capacitance type voltage transformer |
| CN104155626A (en) * | 2014-08-15 | 2014-11-19 | 国家电网公司 | System of detecting ground potential rising-resisting ability of voltage transformer |
Non-Patent Citations (4)
| Title |
|---|
| 李璿 等: "高压引线引起电容式电压互感器附加误差的研究", 《2012年中国电机工程学会年会论文集》 * |
| 杜宇 等: "电容式电压互感器误差及现场测试影响因素分析", 《内蒙古电力技术》 * |
| 林成理: "浅谈CVT引线夹角对误差的影响", 《科技资讯》 * |
| 舒开旗 等: "电容式电压互感器的误差测试", 《湖北电力》 * |
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Effective date of registration: 20170609 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: China-EPRI Electric Power Engineering Co., Ltd. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: State Grid Smart Grid Institute Applicant before: China-EPRI Electric Power Engineering Co., Ltd. |
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